Botany Chpt 10

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Bacteriophages (phages)

Bacterial viruses
Proteins contain __________ but DNA does not?

Sulfur
DNA and RNA are _________ ________ consisting of long chains of chemical units.

nucleic acids
Nucleaotides

long chains (polymers) of chemical units (monomers) that make up DNA and RNA
4 types of nucleotides that make up DNA and RNA
- (A) Adenine
- (C) Cytosine
- (T) Thymine
- (G) Guanine
Nucleotides consists of three components?
- 1. A nitrogenous base
- 2. a sugar
- 3. A phosphate group
________ are joined to one another by covalent bonds between the sugar of one __________ and the phosphate of the next.

Nucleotide
A repeating pattern of sugar-phosphate-sugar-phosphate.

sugar-phosphate backbone
The four nucleotides found in DNA differ only in their _____________ __________.

nitrogenous bases
_________and _______ are single-ring structures called pyrimidines.

Thymine (T) and Cytosine (C)
Pyrimidines?

single-ring structures of thymine and cytosine
__________ and _________ are larger double-ring structures called purines.

Adenine (A) and Guanine (G)
Purines?

larger, double-ring structures of adenine and guanine
How is RNA different from DNA?
- 1. sugar ring has --OH group attached to the C atom
- 2. Instead of thymine RNA has uracil (U)
Double Helix?

Two polynucleotide strands combined that make up DNA
A double-ringed base (purine) should always be paired with a ______-_______ on the opposite strand

single-ringed base
Semiconservative model?

The model for DNA replication